@InProceedings{song2019mass,
  title = 	 {MASS: Masked Sequence to Sequence Pre-training for Language Generation},
  author = 	 {Kaitao Song and Xu Tan and Tao Qin and Jianfeng Lu and Tie-Yan Liu},
  booktitle = 	 {Proceedings of the 36th International Conference on Machine Learning},
  year = 	 {2019},
  series = 	 {Proceedings of Machine Learning Research},
  publisher = 	 {PMLR}
}